A Study of CART-PSMA-TGFβRDN in Patients With Metastatic Castration Resistant Prostate Cancer

A Phase 1 Open-Label, Multi-Center Study of PSMA Targeted Genetically Modified Chimeric Antigen Receptor T Cells in Patients With Metastatic Castration Resistant Prostate Cancer

Multi-center, open-label, Phase 1 study of the safety, tolerability and feasibility of dosing patients harboring metastatic castration resistant prostate cancer (mCRPC) with genetically modified autologous T cells (CART-PSMA-TGFβRDN cells) engineered to express a chimeric antigen receptor (CAR) capable of recognizing the tumor antigen prostate-specific membrane antigen (PSMA) and activating the T cell.

Study Overview

• Status: Terminated
• Conditions: Metastatic Castration-resistant Prostate Cancer
• Intervention / Treatment: Biological: CART-PSMA-TGFβRDN; Drug: Cyclophosphamide; Drug: Fludarabine; Drug: Anakinra

Detailed Description

This is a Phase 1 single-arm study designed to identify the dose and regimen of CART-PSMA- TGFβRDN cells that can be safely administered intravenously following the lymphodepletion (LD) regimen to patients with metastatic castration resistant prostate cancer (mCRPC). Following Dose Escalation, a Cohort Expansion will enroll patients to further explore the safety and tolerability of the selected dose and schedule.

It is anticipated that up to 50 patients will enroll in this study in both dose escalation and cohort expansion.

• Study Type: Interventional
• Enrollment (Actual): 16
• Phase: Phase 1

Contacts and Locations

Study Locations

• United States
  • Florida
    • Tampa, Florida, United States, 33612
      • Moffitt Cancer Center
  • Kansas
    • Kansas City, Kansas, United States, 66160
      • The University of Kansas Hospital
  • Missouri
    • Saint Louis, Missouri, United States, 63110
      • Washington University School of Medicine
  • New York
    • New York, New York, United States, 10032
      • Columbia University Medical Center
  • Pennsylvania
    • Philadelphia, Pennsylvania, United States, 19104
      • University of Pennsylvania
    • Philadelphia, Pennsylvania, United States, 19107
      • Thomas Jefferson University
    • Pittsburgh, Pennsylvania, United States, 15232
      • University of Pittsburgh Medical Center
  • Tennessee
    • Nashville, Tennessee, United States, 37203
      • Sarah Cannon Research Insitute
  • Washington
    • Seattle, Washington, United States, 98195
      • University of Washington Medical Center

Participation Criteria

Eligibility Criteria

• Ages Eligible for Study: 18 years and older (Adult, Older Adult)
• Accepts Healthy Volunteers: No

Description

Inclusion Criteria:

• Confirmed histologic diagnosis of prostate cancer and have mCRPC, with castrate levels of testosterone (<50 ng/mL)
• PSA measurable disease per Prostate Working Group 3 (PCWG3) criteria
• Prior therapies defined as at least 2 prior lines of systemic therapy for prostate cancer, including at least one second generation androgen receptor inhibitor and/or CYP17α inhibitor. At least one line of prior therapy must be in the mCRPC setting
• Estimated estimated glomerular filtration rate ≥ 60 mL/min by Modification of Diet in Renal Disease criteria
• Alanine aminotransferase (ALT) and aspartate aminotransferase (AST) ≤ 2.5x the upper limit of normal (ULN); patients with hepatic metastases ALT and AST ≤ 3.0 x ULN
• Serum total bilirubin < 1.5 mg/dL unless patient has known Gilbert's Syndrome, then serum bilirubin ≤3 mg/dL
• Serum albumin ≥ 3.0 g/dL
• Left ventricular ejection fraction (LVEF) ≥ 50%. LVEF assessment must have been performed within 8 weeks of enrollment
• Hemoglobin ≥ 8 g/dL
• Absolute neutrophil count ≥ 1000/μL
• Platelet count ≥ 75,000/μL
• Patients who have not undergone bilateral orchiectomy must be able to continue gonadotropin-releasing hormone (GnRH) therapy during the study
• Eastern Cooperative Oncology Group (ECOG) score of 0 or 1
• Toxicities from any previous therapy must have recovered to Grade 1 or baseline
• Patients of reproductive potential agree to use of approved highly effective contraceptive methods

Exclusion Criteria:

• Active invasive cancer, other than the proposed cancer included in the study, within 2 years prior to screening, unless treated with curative intent
• Current treatment with systemic corticosteroids (defined as a dose greater than the equivalent of prednisone 10 mg/day)
• Active autoimmune disease (including connective tissue disease, uveitis, sarcoidosis, inflammatory bowel disease or multiple sclerosis) or a history of severe autoimmune disease requiring prolonged immunosuppressive therapy (any immunosuppressive therapy within 6 weeks prior to screening visit)
• Current human immunodeficiency virus (HIV), hepatitis C virus, hepatitis B virus infections; Patients who are hepatitis B core antigen positive, hepatitis B surface antigen negative, should have a quantitative viral load measured; If viral load is undetectable, the patient will not be excluded if hey are able to be treated with anti-viral medication for at least 7 days prior to lymphodepletion until at least 6 months after infusion with viral load and ALT monitoring
• Active or uncontrolled medical or psychological condition that would preclude participation
• History of seizure disorder
• Prior allogeneic stem cell transplant
• Central nervous system malignancy
• History of severe infusion reaction to monoclonal antibodies or biological therapies, or to study product excipients that would preclude the patient safely receiving CART-PSMA-TGFβRDN cells
• History of being previously treated with a J591 antibody-based therapy
• Ferritin levels ≥ 4x the upper limit of normal prior to apheresis or prior to the start of lymphodepleting chemotherapy
• Active or recent (within the past 6 months prior to apheresis or lymphodepletion) cardiovascular disease, defined as (1) New York Heart Association Class III or IV heart failure, (2) unstable angina, (3) a history of recent (within 6 months) myocardial infarction or sustained (> 30 second) ventricular tachyarrhythmias, or (4) cerebrovascular accident
• Any active infection currently being treated or any infection within the last 6 weeks that required 7 days or more of IV antibiotics or any active infection within the last 4 weeks that requires use of oral antibiotics. Patients may be eligible once these timeframes elapse and with evidence that the infection has completely resolved
• Have inadequate venous access for or contraindications for the apheresis procedure
• Must agree not to participate in a conception process or must agree to a highly effective method of contraception

Study Plan

How is the study designed?

Design Details

• Primary Purpose: Treatment
• Allocation: N/A
• Interventional Model: Sequential Assignment
• Masking: None (Open Label)

Number of Arms

1

Arms and Interventions

Participant Group / Arm

Intervention / Treatment

Experimental: Dose Escalation; Dose escalation of intravenous CART-PSMA-TGFβRDN cells for patients with metastatic castration resistant prostate cancer

Biological: CART-PSMA-TGFβRDN; Intravenous administration of genetically modified autologous T cells engineered to express a protein capable of recognizing the tumor antigen prostate-specific membrane antigen (PSMA), as well as a dominant negative TGFβ receptor; Drug: Cyclophosphamide; Patients will receive cyclophosphamide and fludarabine lymphodepletion chemotherapy followed by the investigational product, CART-PSMA-TGFβRDN genetically modified T cells; Drug: Fludarabine; Patients will receive cyclophosphamide and fludarabine lymphodepletion chemotherapy followed by the investigational product, CART-PSMA-TGFβRDN genetically modified T cells; Drug: Anakinra; In applicable cohorts, patients will receive anakinra prophylactically starting on the day of administration of investigational product, CART-PSMA-TGFβRDN genetically modified T cells

What is the study measuring?

Primary Outcome Measures

Outcome Measure	Measure Description	Time Frame
Dose Escalation: Dose Identification of CART-PSMA-TGFβRDN	Incidence of Dose Limiting Toxicity (DLT)	Up to 2 years
Cohort Expansion: Safety of CART-PSMA-TGFβRDN	Percentage of patients experiencing adverse events (AEs), including serious and severe AEs overall, by dose level, and severity grade	Up to 2 years

Secondary Outcome Measures

Outcome Measure	Measure Description	Time Frame
Preliminary efficacy of CART-PSMA-TGFβRDN as assessed by biochemical Objective Response Rate (ORR)	ORR defined as the proportion of patients with maximal prostate-specific antigen (PSA) decline of greater than or equal to 50% at 12 weeks post infusion	Up to 2 years
Feasibility of CART-PSMA-TGFβRDN	Proportion of patients who did not receive CART-PSMA-TGFβRDN cells	Up to 2 years
Peripheral expansion and persistence of CART-PSMA-TGFβRDN	Quantitative polymerase chain reaction (qPCR)	Up to 15 years

Collaborators and Investigators

• Sponsor: Tceleron Therapeutics, Inc.

Study record dates

Study Major Dates

• Study Start (Actual): November 22, 2019
• Primary Completion (Actual): November 7, 2022
• Study Completion (Actual): November 7, 2022

Study Registration Dates

• First Submitted: December 12, 2019
• First Submitted That Met QC Criteria: January 9, 2020
• First Posted (Actual): January 13, 2020

Study Record Updates

• Last Update Posted (Actual): August 21, 2023
• Last Update Submitted That Met QC Criteria: August 16, 2023
• Last Verified: August 1, 2023

More Information

Terms related to this study

• Keywords: Prostate Cancer; T-cells; Chimeric Antigen Receptor (CAR); Prostate-Specific Membrane Antigen (PSMA)
• Additional Relevant MeSH Terms: Neoplasms; Urogenital Neoplasms; Neoplasms by Site; Genital Neoplasms, Male; Prostatic Diseases; Urogenital Diseases; Male Urogenital Diseases; Genital Diseases, Male; Genital Diseases; Prostatic Neoplasms; Physiological Effects of Drugs; Molecular Mechanisms of Pharmacological Action; Antirheumatic Agents; Antineoplastic Agents; Immunosuppressive Agents; Immunologic Factors; Antineoplastic Agents, Alkylating; Alkylating Agents; Myeloablative Agonists; Cyclophosphamide; Fludarabine; Interleukin 1 Receptor Antagonist Protein
• Other Study ID Numbers: CART-PSMA-TGFβRDN-02

Plan for Individual participant data (IPD)

• Plan to Share Individual Participant Data (IPD)?: NO

Drug and device information, study documents

• Studies a U.S. FDA-regulated drug product: Yes
• Studies a U.S. FDA-regulated device product: No